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प्रश्न
Name the following:
The part of the eye responsible for change in the size of the pupil.
उत्तर
Iris
APPEARS IN
संबंधित प्रश्न
List the parts of the human eye that control the amount of light entering into it. Explain how they perform this function.
The human eye can focus objects at different distances by adjusting the focal length of the eye lens. This is due to ______.
How does the eye regulate the amount of light that falls on the retina?
How does the eye regulate the amount of light that falls on the retina?
Draw a labelled sketch of the human eye.
What is the name of:
the light-sensitive layer in the eye?
Ciliary muscles of human eye can contract or relax. How does it help in the normal functioning of the eye?
There are two types of light-sensitive cells in the human eye:
What is each type called?
Name the cells on the retina of an eye which are sensitive to (i) bright light (ii) dim light (iii) sensation of colour.
Which of the following changes occur when you walk out of bright sunshine into a poorly lit room?
(a) the pupil becomes larger
(b) the lens becomes thicker
(c) the ciliary muscle relaxes
(d) the pupil becomes smaller
Explain clearly why, a person who has lost the sight of one eye is at a disadvantage compared with the normal person who has two good eyes.
The animal which does not have eyes that look sideways is:
(a) Horse
(b) Chicken
(c) Lion
(d) Fish
Mention if the following statement is true (T) or false (F) Give reason.
Sometimes medicines dropped into the eyes come into the nose and even throat
______ is the structural and functional unit of living organisms.
From where the following nerves arise.
Optic nerve
Match the following
| 1. | Conjunctiva | a. | Coloured part of eye |
| 2. | Cornea | b. | Photosensitive layer |
| 3. | Iris | c. | Refraction |
| 4. | Retina | d. | Protection |
Match the following:
|
Column - I |
Column - II | ||
| 1 | Retina | a | Path way of light |
| 2 | Pupil | b |
far point comes closer |
| 3 | Ciliary muscles | c |
near point moves away |
| 4 | Myopia | d | Screen of the eye |
| 5 | Hypermetropia | e | Power of accommodation |
Assertion (A): Rods and Cones are photoreceptors in the sclera of eyeball.
Reason (R): Rods are sensitive to dim light.
Name the following:
Kind of retinal cells sensitive to dim light.
With reference to human eye answer the question that follow:
Name the part of the eye associated with the layer providing nourishment to the eye.
